Drawing die



1,530000 J. J. KAUF'FMAN DRAWING DIE Fiied March 2,7, 1924 2 Sheets-Sheet 1 J. J. KAUFFMAN DRAWING DIE Filet! March 2'7, 1924 2 Sheets-Sheot 2 W 5Jubenioz Patented Mar. 17, 1925.

UNITED STATES PATENT OFFICE.

DRAWING DIE.

Applieation filedMarch 27, 1924. Serie]. N0. 702,203.

T all 107mm z't may concern:

Be it known that I, JOHN J KAUFFMAN,

a eitizen of the United States, residing at Monooacy Station, in the county of Berks anal State of Pennsylvania, haveinvented certain new and useful Improvements in Drawing Dies, of whiel1 tl1e following is a 13ecification. v

TliiS invention relates to improvements in drawing dies, and the object in ehe present instance is to provide a die in whieh, by a single operation, a completed artiele may be made, where it l13S heretofore required a plurality of operations, as for instance a relatively deep cup like metal piece.

The invention consists of a duplex die provided with a series 01 radially arranged plungers adapted to move in unison with eaeh other and synchronioally with the movement of the cutting and dravving members 0f the die, and these plungers are so placed and connected tl1at each will supply a proportional share of the efiort required 1:0 properly draw the objeet to form.

The object of the invention being primarily to finish the product ab a single operation without danger 0f the die tearing through the artiele being drawn.

The invention is more fully described in illustrated in the drawings forming a part of this application, and in whichz Figure 1 is a neutral seetional view of 1ny invention, with tl1e disc cut from the sheet stoek and the drawing die ready t0 begin its downward movement.

Figure 2is a like view, with tl1e die ap proaching the limit of its downward movement.

Figure 3 shows, in art, a lan view with the die removed-in part a section through 33-and in part a section through 44, of Figure 1.

Figure 4 is an enlarged fragment in perspective, showing the juncture between a rock arm and a plun er.

The numeral 1 des1gnates the die holder. 2 represents the male and 3 the female member of the cutting die. 4 represents the male and 5 the female member of the drawing die.

The numeral 6 designates the ejector, which is formed with a c0ne-shaped base member 7 and which latter is baeked by a spring 20 adapted to return the ejector to the accompanying specifieation and elearly normal reised position and inoidently to open the plungers 8. 1

These plungers 8 a1e arranged radially in the die holder, and the number will be determined by the partieular work t0 be done W b v the dies in any given case. These plungers are eaeh carried on the upper extremity of a rock arm- 9, which latter are pivotally mounted in tl1e. dieholder, below the plungers and the conneotion betvveenv 05 each roek arm and plunger is through the medium of a pin 12 carried by the plunger and fitting slidably in an elongated slot 13 in the jaw-shapedripper kextremity of the rock arm. TU

The lovver extremities of these rock arms a1e each provded Wih a roller 10, and these rollers rest normally against the tapered Wall of the eone-shaped memloer 7. v The member 7 is formed with a -fianged lower 7.5

extremity to serve es a resistance. for the spring loeated beneathit and Wl1ich tends to keep it normally raised.

As indieated in Figure 3, the plungers and the rockarms are arranged radially in the die holder,each adapted t0 move freely in its respective slot.

The numeral 15 designates a sheet of metal 01' other stoek from which the object, in the form of a blank is to be eut. The entting die 2-3 outsthe blank, designated in Figure 1 loy the nnmeral 16 sind holds it firmly against the upper face of the female member 6 of tl1e drawing die, and the male member 0f the drawing die begins its down- Ward movement, depressing the centre of the disc and with it the ejector 6, against the compression of the spring 20.

As this downward movernent of the drawing die continues, the tapered or cone-shaped member 7 Will bear against the rollers 10 and cause the rockarms 9 to turn on their pivotal points, whieh' will move the upper extremities of the rookarms inwardly, to v ward the centre 01: the die holder. Inasmuch es each rookarm carries one of the plungers on its upper end, this movement Will oause all of the plungerS to move toward the centre in unison. The inner ende of tl1ese plungers extend normally to the line of the inner Wall of the die member 3, so that, when t'he blank 16 has been formed, as above deseribed, by the descent of the die member 2, the inner ende of these plungers bear a very intimate relation with the periphery of the said diso blank, and as soon es the downward movement of the member 7 begins, and the rookarms xnove, these plungers will begin to exert a pressure against the edge of the blank 16, so that the formation of the produot is very materially aided in that pressure is broughb to bear against this blank from all points,

helping to force the metal into the die as' the plunger forees it downward, with the result that the metal diso is drewn into the desired shape without any undue strain 01 pressure being exerted at one point. drawing of. the metal has been aecomplished by the drawing die proper, laut it l121s been relieved of agreat portion of its duty by the aid 0f the series of radially arranged and eoacting plungers, which l1ave forced the metal into proper position gradually es the die has been lowered, thus effeeting a complete product in a Single operation.

The spring 20 in its opening aetion, retu1ns the ejectoi to its normal position Within the drawing die, and, in its upward m0vement, it ejeots the finished artiole, made by the downward aetion of the die membel 2, a]oove described.

VVhat I claim and desire to secu1e by Letters Patent, is:

l. A d1awing die oomp'rising a die holder,

a cutting die, a drawing die, a series of radially movable plungers, a, se11es of rookarms The connected with the plungers and pivotally mounted in the die holder, rollers eerried Dy the rockarms, an ejeotor haVing a tapered porb1on against wh1ch ehe rollers bear, und.

spring means for returning the ejeetor to normal raised pos'ition.

3. In a device o-f the oharacter described, a die holder, a eutting die, a dra.wing die, a series of radially movaible plungers in the die holder, a series of pivotally mounced roekarms for actuating the plungers, a Vertioally movable ejector actuated in one direction by the drawinq die, rollersearried by the rockanns and adapted for contact by the ejeotor, whereby the actuation of tl1e drawing die Will cause the roekarins and the plungers to move in unison with each 0ther and synchronically with t-he drawing die.

In testimony whereof I aflix my signature.

JOHN J. KAUFF'MAN. 

